January 8, 2006 – The Ford F-250 Super Chief concept uses what the company calls "Tri-Flex fueling", enabling the supercharged V-10 to run for 500 miles between fill-ups on hydrogen, E85 ethanol or gasoline. The tri-fuel flexibility is one possible innovation by Ford to help pave the way for hydrogen vehicles, as the nation's ethanol and hydrogen fueling infrastructure continues to develop. The concept truck and its name are inspired by the bold, American Super Chief trains of the nation's past. Super Chief is Ford's most advanced, well-appointed pickup ever – designed to build on the standard for interior excellence established by the new F-150.